Earl Co. was formed on January 2, 2007, to sell a single product. Over a two-year period, Earl's acquisition costs have increased steadily. Physical quantities held in inventory were equal to three months' sales at December 31, 2007, and zero at December 31, 2008. Assuming the periodic inventory system, the inventory cost method which reports the highest amount of each of the following is

InventoryCost of Sales

December 31, 20072008

a.LIFOFIFO

b.LIFOLIFO

c.FIFOFIFO

d.FIFOLIFO

why the answer is C? can someone explain it plzz